I've been to Qdoba a few times now and I have to compare it to Moe's and Chipotle mainly because they serve the same menu items. In order from greatest to least, I like Moe's, Qdoba, and Chipotle.
Qdoba is very similar to Chipotle in its menu offerings and its toppings, but I like the flavor of the meat here better. Of course, the burritos weigh almost a pound, so make sure you're hungry because this place can feed a horse!
http://www.qdoba.com/